Incubator.



PATENTED AUG. 30, 1904.

A. G. SMITH. INGUBATOR. APPLIOATION FILED JULY 5, 1901. RENEWED MAY 16, 1904.

N0 MODEL.

5 Z W a M No 768,631. Patented August 30, 1904.

UNITED STATES PATENT. OEEIcE.

ADOLPHUS G. SMITH, OF BOSTON, MASSACHUSETTS, ASSIGNOR OF TVVO- THIRDS TO CHARLES V. H. SANBORN, OF BOSTON, MASSACHUSETTS, AND ALBERT P. KENT, OF CHELSEA, MASSACHUSETTS.

INCUBATOR.

SPECIFICATION forming part of Letters Patent No 768,631, dated A g 30, 1904. Application filed July 5, 1901. Renewed May 16, 1904. Serial No. 208,090. No modelfl T 107mm it y H/earn: of electromagnets B C, the magnets having Be it known that I, ADoLPHUs G. SuITII, a contact-plates 6 7, with which coacts an arm citizen of the United States, residing at Bos- 8 of an armature D, represented as mounted ton, county of Suffolk, State of lVIassachusetts, upon a vertical pivot 9, the pivot of the arma- 5 have invented an Improvement in Incubatorture being connected by a wire 10 with the Heating Devices, of which the following debattery F, while the wire 12 at the opposite scription, in connection with the accompanypole of said battery leads to the plate a. The ing drawings, is a specification, like characters egg-chamber contains, as herein represented, on the drawings representing like parts. suitable rods, as 13, upon which are strung 10 This invention has for its object the prosuitable non-conductors, represented as porceduction of a novel incubator-heating device lain spools 1 1, there beinga line of said spools whereintheheatfurnished by electricityis and from one to the other end of the chamber. may be kept substantially uniform. These spools receive about them in succession Figure 1 in side elevation, partly broken out, a wire 15, extended from a battery E, the wire 5 represents an incubator embodying my inveni after leaving the last spool being connected tion; Fig. 2, a section in the dotted line x, with the metal plate 16, a second plate 17, in- Fig. 1; and Fig. 3 isa detail of the switch opsulated by suitable insulatingrnaterial 18 (see 6 5 erative in connection with the electric heater. Fig. 3) from the plate 16, having connected The/framework of the incubator consists, with it a suitable Wire, as 19, which leads to 20 essentially, of a suitable box-like frame A, the opposite pole of the battery E. The cir- Which may stand on legs A, the frame being cuit on the battery E is completed by insertcomposed, preferably. of double sides and ing the projecting end (2 of the armature D ends, the space between the material constibetween said plates,as represented in the drawtuting the double sides and ends being filled ings, thus causing the battery to heat the 5 in with a non-conductor of heat, as at b, which wire 15 entering into the heater and supply the may beasbestos, infusorial earth, or any usual proper amount of heat to the incubator. non-conducting material. The sides and ends The point 2 is connected by wire 20 with of the box receive between them a sheet-iron the wire of one of the magnets, as C, and the top plate 0, on which is laid suitable non-heatpoint 3 is connected by wire 21 with a wire 3 conducting material, as at b, and thereafter a leading to the magnet B.

board a is applied to cover the material Z), and Having laid the eggs upon the support (Z, the box is then completed byasuitable cover (t the door (4* will be closed, and the armature D The box has a suitable bottom (0 and one side will be turned into the position shown in Figs. ofthe boxhasadoorcfi, by which to gain access 2 and 3, closing the circuit of the battery E 35 to the egg-chamber and to the egg-sustainer on the electric heater described. In this con- (Z, which may be a shelf of any usual kind. dition the arm 8 of the armature will rest on The egg-chamber is provided with a suitable the contactplate 6 and the tongue 0 on the 8 5 thermostat 6, shown as a tongue, composed of point 2. Before the heat rises to a degree two or more different metals and united to a that might be injurious to the eggs the ther- 4 metallic block a, secured to one wall of the mostat-tongue 6 will be actuated by the heat box. The box also sustains in said chamber and made to contact with the point 3, and imsuitable points 2 3, sustained, as herein shown, mediately the circuit on the magnet B through 9 each preferably by a suitable arm, as 1, each the battery F will be closed, swinging the end arm having a depending end 5. Normally cl of the armature D from between the plates 45 the free end of the tongue contacts with the 16 17, thus cutting ofi the heater, and at the point 2. The point2 and the fixed end of the same time the arm 8 will meet the contact 7. tongue are in a normally closed electric cir- As the temperature decreases the tongue e cuit containing a battery F and suitable pairs will gradually assume its normal position and the armature has been started by closing the circuit thereon.

The electric current may be supplied to the heater from any suitable source of electric energy, the battery F being merely shown as one such source.

Having described my invention, what I claim, and desire to secure by Letters Patent,

1. An incubator-heating device comprising an electric heater located within the chamber to be heated, pairs of electromagnets, an armature supported between the pairs of electromagnets and adapted to be moved into diiferent positions by the energization of the pairs of electromagnets said armature having a projecting end to close and break the heating-circuit and having a projecting arm, a thermostat in electric circuit with the pairs of electromagnets and consisting of a flexible tongue having one end supported within the chamber and the other end free, contact-points also within the chamber between which the free end of the flexible tongue projects, arms located in the chamber for supporting the contact-points in fixed position, and contactplates connected to the circuits of the electromagnets and adapted to be engaged by the projecting arm of the armature.

2. An incubator-heating device comprising an electric heater located within the chamber to beheated, pairs of electromagnets, an armature pivotally mounted between the pairs of electromagnets, and having an extended portion-adapted to make and break the electric circuit of the heater, an arm carried by and projecting from the armature, contact-plates separately connected to the said electromagnets, and adapted to be engaged by the arm as the armature moves to make and break the circuit of the heater, a flexible tongue located within the chamber and supported at one end, contact-points disposed near the free end of the tongue and electric circuits connecting the contact-points with the before-mentioned electromagnets and contact-plates.

3. An incubator-heating device comprising an electric heater, located within the chamber to be heated, pairs of electromagnets, an armature pivotally mounted between the pairs of electromagnets and adapted to be moved on its pivot by the energization of one or the other of said electromagnets so as to close the circuit on the electric heater when in one position and to break the circuit when in the other position, an arm carried by and projecting from the armature, contactplates separately in circuit with the electromagnets and disposed to be engaged by the arm, as the armature is moved from one to the other position as described, a flexible tongue sup ported at one end within the chamber and in electric circuit with the armature, and fixed contact-points also within the chamber, between which the free end of the flexible tongue extends, the contact-points being separately in circuit with one of the pairs of electromagnets and its connected contact-plate.

4:. An incubator-heating device comprising an electric heater located within the chamber to be heated, a wire disposed within the chamber, pairs of electromagnets, an armature coacting with the pairs of electromagnets, and adapted in one position to close the circuit through the wire, and in the other position to break the circuit therethrough, a thermostat in an electric circuit with the pairs of electromagnets, and having a tongue supported within the chamber, and contact-points within the chamber between which the free 

